Since Google collects a lot of personal data from each user, search results for the same query are different and personalized. This seems like a perfect solution - beside the tracking.
For example, if someone searches for ‘python’, Google can use the context to show results about either a snake or a programming language. But what happens if someone wants to learn to program in Python as first programming language and has previously searched for a frog and visited the zoo last week?
In my opinion, the information that Google collects is useless and doesn’t enhance the search results.